Mechanical Engineer

This position is remote until the office opens in or around Bryan, TX on or before February 2026, after which time it will be a 100% on site role.

Come join us at Terrestrial Energy, a US developer of advanced, Generation IV nuclear reactors. We are growing our workforce to develop and deploy our Integral Molten Salt Reactor (IMSR) small modular nuclear plant to provide cost‑competitive, clean firm heat and power to industry.

The Mechanical Engineer, under the direction of the Mechanical Engineering Manager, is primarily responsible for design and development of their assigned mechanical systems through the Detailed Engineering phase. Other responsibilities include:

• Prepare calculations, analyses and assessment documents for the development of systems and equipment design.
• Prepare the system classification, design requirements and design summary report in accordance with applicable design guides, procedures, and codes and standards.
• Participate in and contribute to design reviews.
• Communicate and work with various technical disciplines to understand system designs and interfacing requirements.
• Coordinate and interface with the plant layout lead in the development of 3D CAD for the responsible mechanical systems.
• Contribute to timely resolution of mechanical design challenges and address risks.
• Coordinate with, and support work of, other disciplines.
• Conduct presentations to interdisciplinary team and external stakeholders.
• Interface with external vendors, design agencies, technical experts, clients and regulators as required.
• Oversee and collaborate with external vendors, carry out vendor deliverable reviews.
• Provide input to schedules and cost estimates.
• Responsible for ensuring that the budget, timing, and quality of engineering work are executed as required.
• Report progress of project work on a regular basis.
• Mentor junior team members.
• Other duties as assigned.

• Mechanical Engineering
• Communication
• Critical Thinking
• Decision Making
• Leadership
• Planning and Organizing
• Problem Solving
• Results Orientation
• Team player with the ability to collaborate and interact with other groups
• Flexible and adaptable to change

• Post‑secondary degree or diploma in Mechanical Engineering, or an alternate degree in a related field.
• PE Certification, or eligible to obtain a PE Certification.
• Minimum of 8 years of work experience in the design of mechanical systems, preferably within the nuclear industry.
• Demonstrated success in project delivery and the execution of mechanical design methods.
• Expert or working knowledge of nuclear pressure boundary codes including ASME Section III Division 1, CSA N285.0 and ASME B31.1.
• Strong problem identification and problem resolution skills.
• Flexibility to adjust to shifting priorities and deadlines.
• Exceptional interpersonal and communication (both written and verbal) skills.

• Expert or working knowledge of nuclear pressure boundary code ASME Section III Division 5.
• Working knowledge of ANSYS Mechanical, Creo Parametric, or other 3D modelling and FEA software.
• Proficient in CSA nuclear standards such as N285, N286, N299.
• Project Management experience.
• Industry experience in designing systems and components subject to extreme environmental conditions.
• Design experience with reactor shutdown or cooling systems.
• Qualified as per ASME Section III Appendix XXIII and experienced in Design Specifications, Over pressure Protection Reports, and Design Reports.

• Extended Healthcare Plan (Medical, Disability, Dental & Vision), plus an additional Health Spending Account.
• A vacation policy designed to support your work‑life balance.
• EAP Programs available to you and your family.
• $500 Wellness Subsidy.
• Annual Performance Review.
• Paid United Way Volunteer Days – a chance to give back!

Terrestrial Energy requires that the successful candidate be able to access and use information subject to U.S. Export Control Laws, which mandate all citizen ships (including dual citizen ships) be from the U.S. Department of Energy’s List of Generally Authorized Countries (10 CFR Part 810 Appendix

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Terrestrial Energy Inc. is an equal opportunity employer and does not discriminate on the basis of any legally protected status or group. We encourage applications from all qualified individuals.

If you require accommodation during the application or interview process, please advise us as soon as possible so appropriate arrangements can be made. If you require technical support in a format that is accessible to you, please contact Access